Fail Actions on CSM Serverfarms
·3 min read
I’ve talked about probes and stuff on the CSM, but I never mentioned what happens to the connections to a server that fails. That is, if I’m connected to server A in a cluster and that …
Cisco
The Cisco Network Hierarchical Model
·3 min read
I got my CCNP certification library the other day to finally get myself another cert, so I’ve been doing some reading of late. The thing I hate about certs is that, even if you have all the …
Free and Awesome Network Tools
·3 min read
We all have limited budgets these days. Long gone are the days of unlimited resources and uncontrollable expansion of the network, so it’s important that any network dude or dudette pay …
A Simple BGP Lab with Dynamips/Dynagen
·4 min read
I assume you take every word I say to heart and that you’ve been using Dynamips/Dynagen for a few days now, right? Good. That’s a start, but let’s break down a simple lab to make …
Dynamips and Dynagen
·2 min read
I’ve run across articles for these apps a thousand times, so I thought I’d get in on the action. Dynamips and dynagen are a pair of apps that make simulating Cisco routers very easy. I use …
Monitoring the CSM with SNMP
·2 min read
I had an article a few weeks ago about the Cisco CSM, which is a load-balancer module for the 6500 series switches. This thing is a pretty good device, but monitoring the connections to each VIP and …
Object Tracking and HSRP
·3 min read
We’ve done some tracking with HSRP in other articles, but there are lots and lots of ways to use object tracking on an HSRP device. In our example network, we tracked the interface, and, if it …
Intro to Policy Routing
·3 min read
I like [tag]layer-3[/tag] [tag]switch[/tag]es. They give some great flexibility and bang-for-the buck, but most people overlook one issue with these things that can cause security problems. Most …